Thank's for your reply, but I still don't Understand how to get the UUID in esta Instr., Hope I can see you Modify this instr. soon,so that user can connect BLE device directly with the APP inventor,instead of used the NRF Master Control Panel.

Sorry for let you misunderstand,what I meaning is to used the APP inventor program itself to get those two UUID , so that when we want to send/receive data to/from BLE Shield(especial when used other BLE devices) we don't need to used the App "NRF Master Control Panel" to find the UUIDs. After all,a good App should let user more convenience to used.

When creating a BLE app you will need not only to know the Service/Characteristic UUIDs but also how the data is structured/formatted. The user should not have to do any of this. NRF Master Control Panel is the tool for the developer to investigate and create the app. This app is created especifically for the Itead BLE Shield and to be used as an example. The app is purposefully made as barebones as possible.